CVE-2026-64452
In the Linux kernel, the following vulnerability has been resolved: 6lowpan: fix NHC entry use-after-free on error path lowpan_nhc_do_uncompression() looks up an NHC descriptor while holding lowpan_nhc_lock.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.22%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: 6lowpan: fix NHC entry use-after-free on error path lowpan_nhc_do_uncompression() looks up an NHC descriptor while holding lowpan_nhc_lock. If the descriptor has no uncompress callback, the error path drops the lock before printing nhc->name. lowpan_nhc_del() removes descriptors under the same lock and then relies on synchronize_net() before the owning module can be unloaded. That only waits for net RX RCU readers. lowpan_header_decompress() is also exported and can be reached from callers that are not necessarily covered by the net core RX critical section, for example the Bluetooth 6LoWPAN L2CAP receive path. This leaves a race where one task drops lowpan_nhc_lock in the error path, another task unregisters and frees the matching descriptor after synchronize_net() returns, and the first task then dereferences nhc->name for the warning. With the post-unlock window widened, KASAN reports: BUG: KASAN: slab-use-after-free in lowpan_nhc_do_uncompression+0x1f4/0x220 Read of size 8 lowpan_nhc_do_uncompression lowpan_header_decompress Fix this by printing the warning before dropping lowpan_nhc_lock, so the descriptor name is read while unregister is still excluded. The malformed packet is still rejected with -ENOTSUPP.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 0.22% probability · 12th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0beccbcf50de125be5520d0ffc59af4bb8655482Patch
- https://git.kernel.org/stable/c/1720db928e5a58ca7d75ac1d514c3b73fd7061a7Patch
- https://git.kernel.org/stable/c/593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168Patch
- https://git.kernel.org/stable/c/80b5c8779acee0550845394fb3e5176a398aa24cPatch
- https://git.kernel.org/stable/c/9c2f5c0829a8c8b904dae36be6d8056b719ac605Patch
- https://git.kernel.org/stable/c/a8e3a94711134e898c6021a6b77374efa91b3639Patch
- https://git.kernel.org/stable/c/b713aa0cc344f10f7a9928a230b5f5e780d04078Patch
- https://git.kernel.org/stable/c/cc27aea4d454abfb385ee2c9499c78b96db9b728Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.